Userland local agent sandbox with real-time network control dashboard
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HN · launched Mar 13, 2026 · 7 upvotes (top 59%) · 0 views
Niche: ai agent execution sandboxes · 137 launches, 6 in the last 7 days ▼ -25% · Explore this niche →
Category and tags
- Horizontal
- Dev tools
- Developer
- AI-native
- Commercial product
Visit website ↗ Source listing ↗
More like this: all 137 launches in ai agent execution sandboxes →
Could you build this?
No Greywall requires low-level OS kernel tracing, syscall interception (e.g. eBPF, ptrace, or macOS Endpoint Security framework), and fine-grained sandbox enforcement without containers.
What it would actually take: A real implementation is written in Go or C using Linux eBPF/seccomp filters and the macOS Endpoint Security (ES) API to intercept low-level syscalls (execve, open, connect). The hard parts are building a cross-platform userland sandbox that can reliably inspect and block network packets and file I/O synchronously with sub-millisecond latency, while safely preventing bypasses. This requires deep systems programming and OS security kernel expertise.
Discussion
1 comment analyzed.
Competitors mentioned: Fence, Cubbi
Concerns raised: Network restrictions and proxy env var bypasses, macOS transparent TUN support not yet available, Complexity of transparent proxy approach
Feature requests: Full conversation observability including tool calls, Semantic firewall understanding agent intent beyond domain filtering, Credential replacement on the fly before data leaves machine
Competitors
Other products that read as similar to this one : 2998 launches clear the similarity bar, closest 8 shown.
Attention rank: #1884 of 2999 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).
Launched 133 days after the earliest competitor.
- Silos, An open source (MIT) CLI sandbox orchestrator for local agents · hn · 2026-11-12 · 5 upvotes · similarity 0.66
- Veris · hn · 2026-05-07 · 9 upvotes · similarity 0.65
- TakoVM · hn · 2026-06-30 · 6 upvotes · similarity 0.59
- Endo Familiar, an O-cap based JavaScript agent sandbox · hn · 2026-04-23 · 13 upvotes · similarity 0.59
- AgentNest, self-hosted sandboxes for AI agents · hn · 2026-07-23 · 12 upvotes · similarity 0.59
- boxery · github · 2026-10-31 · 63 upvotes · similarity 0.59
- pipod · github · 2026-10-01 · 144 upvotes · similarity 0.58
- Blast · hn · 2026-08-28 · 11 upvotes · similarity 0.58
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